A.am flying | B.have flown | C.will have flown | D.will fly |
A.are | B.were | C.had been | D.be |
A.made | B.taken | C.had | D.done |
A.knows | B.know | C.have known | D.am to know |
A.had set up | B.had been set up | C.set up | D.were set up |
A.is still being fixed | B.is not fixing |
C.has already been fixed | D.has not fixed |
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